I'm not sure they have. It seems odd to me to go to the same well twice in two seasons but...

Spoiler/SpeculationWard and Morse at this point would seem to be very different in terms of motivation. Ward has always been loyal to the person whether it be Garrett in S1 and Skye in S2. For as many times as Skye has called Ward a Nazi, it's been in a superficial, our enemy sort of way. Ward in the text isn't shown to believe in Hydra's aims so much as plot keeps having him orbit in that direction either because of who he follows or what his goal for Skye was.

Morse on the other hand really has been dropping hints in a subtle manner for what seems like a while about a disconnect between Fury and Coulson. The problem is Fury's style of operations is what incubated Hydra from within. So the idea that she realizes (or already realized) her goals (non-superficially) actually align with Hydra make perfect sense. And this is a show about spies, so this should be a repeating plot point.

Ultimately, if the plot theoretically goes this way the contrast of how the team deals with Bobbi vs. Ward could be used any number of ways. Essentially the more balls you have bouncing in the hopper, the more ways it can go.

I'm still sticking with the theory I floated earlier, which is that they're actually Secret Avengers working with the Avengers to keep tabs on SHIELD. Maria Hill is working for Stark now, so they have potential to be privy to the info. Also, I can't imagine them turning out to be Hydra, and this would set them up nicely for an Age of Ultron cameo, which I think they sorta need to do at the point... payoff Coulson being alive and seeing the Avengers again after the last movie.

I also think we're going to see at least one Avenger on the show this spring.